420 Series 2-21
2.7 Keyboard Troubleshooting
To determine if the 420 series keyboard is functioning properly, perform the following proce-
dures. Start with Procedure 1 and continue with the other procedure as instructed.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector and Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
Execute the Keyboard Test in the Diagnostic Program. Refer to Chapter 3, Tests and Diag-
nostics, for more information on how to perform the test program.
If an error occurs, go to Procedure 2. If an error does not occur, the keyboard is functioning
properly.
Procedure 2 Connector and Replacement Check
The keyboard is connected to the system board by a flat cable. This cable may be discon-
nected or damaged. Disassemble the 420 series as described in Chapter 4, Replacement
Procedures, and perform the following checks:
Check 1 Make sure the keyboard cable is not damaged and is connected to the system
board.
Keyboard cable PJ14 System board
If this cable is damaged, replace the keyboard with a new one. If the cable is
disconnected, firmly connect it. Perform Procedure 1 again. If the keyboard is
still not functioning properly, perform Check 2.
Check 2 The keyboard controller on the system board may be damaged. Replace the
system board with a new one. Refer to Chapter 4, Replacement Procedures, for
more information.
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